单项选择题

According to the report, dust formation can be reduced when _________.

A．asbestos is damp
B．dry asbestos is employed
C．workers wear protective clothing
D．workers use asbestos in the open air
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单项选择题
It can be inferred from the passage that the real danger comes from _________.
A．the asbestos dust that people take in
B．the contact of the worker's skin with asbestos particles
C．the inferior quality of the asbestos itself
D．the excessive use of man-made asbestos material.
单项选择题
By scholarly skywriting , the author means scholars _________.
A．get new ideas from discussions through electronic networks
B．have their scientific papers openly published on the Net
C．are free to express their ideas on the line
D．create, polish and publish their ideas on the line
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